If you push the defrost button, you will get max heat and compressor will run for dehumidification. You could use the up arrow and get some bleed to the winshield and it will be the desired temperature as selected by the thumbwheel.

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Benzmac:
Donnie Drummonds
1992 500E (very soon I hope
1981 280GE SWB
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM